Neither halt order was enforced. There was a halt for maintenance and for the log trains to catch up. have check exactly when that occurred. Over a hundred broken down tanks were able to catch back up with their battalions. Without that the battalions that did arrive at the coast would be significantly weaker. As it was tank strength in the lead divisions was under 30%. The 7th PzD reached the coast on the 22d May with just 25 tanks. The balance were either broken by the road or attempting to catch up after repairs. Pushing harder & arriving at the coast two days earlier means effective no tanks, thinner motor infantry battalions, less artillery ammunition, and a longer wait for all that to catch up.
A faster advance may even make Kliests armored group more vulnerable to the flank attacks. ie: the artillery of the 7th PzD that halted the British tanks at Arras, runs out of ammunition in the first half hour. Or is caught piecemeal because the battalions are strung out further to the west & unable to support each other. Or what happens at Montcornet if the AT guns that halted DeGaulles attack are further west & unable to defend the XIX Pz Corps supply road?